<template>
	<div class="wrapper">

		<!-- header部分 -->
		<header>
			<p>商家登陆</p>
		</header>

		<!-- 表单部分 -->
		<ul class="form-box">
			<li>
				<div class="title">
					商家账号：
				</div>
				<div class="content">
					<input type="text" v-model="businessId" placeholder="请输入商家账号">
				</div>
			</li>
			<li>
				<div class="title">
					密码：
				</div>
				<div class="content">
					<input type="password" v-model="password" placeholder="请输入密码">
				</div>
			</li>
			<!-- 验证码部分 -->
			<li>
				<div class="title">
					验证码：
				</div>
				<div class="content">
					<input type="text" v-model="captchaInput" placeholder="请输入验证码">
					<span class="captcha-text">{{ generatedCaptcha }}</span>
					<button @click="generateCaptcha" class="refresh-captcha">刷新</button>
				</div>
			</li>
		</ul>

		<div class="button-login">
			<button @click="login">登陆</button>
		</div>
		<div class="button-register">
			<button @click="register">注册商家</button>
		</div>

		<!-- 底部菜单部分 -->
		<Footer></Footer>
	</div>
</template>
<script>
	import Footer from '../components/Footer.vue';

	export default {
		name: 'BusinessLogin',
		data() {
			return {
				businessId: '',
				password: '',
				captchaInput: '', // 用户输入的验证码
				generatedCaptcha: '' // 生成的验证码
			}
		},
		methods: {
			login() {
				if (this.businessId === '') {
					alert('商家账号不能为空！');
					return;
				}
				if (this.password === '') {
					alert('密码不能为空！');
					return;
				}
				if (this.captchaInput === '') {
					alert('验证码不能为空！');
					return;
				}
				if (this.captchaInput !== this.generatedCaptcha) {
					alert('验证码不正确！');
					this.generateCaptcha(); // 验证失败后生成新验证码
					return;
				}

				// 发送商家登录请求
				this.$axios.get('Business/BusinessId', {
					params: {
						businessId: this.businessId,
						password: this.password
					}
				}).then(response => {
					let business = response.data.result;
					if (business === null) {
						alert('账号或密码不正确！');
					} else {
						// 将商家信息存储在 session 中
						this.$setSessionStorage('business', business);
						this.$router.push({
							path: '/businessmanagement',
							query: {
								businessId: this.businessId
							}
						});

					}
				}).catch(error => {
					console.error(error);
				});
			},
			register() {
				this.$router.push({
					path: 'businessRegister'
				});
			},
			generateCaptcha() {
				// 生成一个随机的4位数验证码
				this.generatedCaptcha = Math.random().toString(36).substr(2, 4).toUpperCase();
			}

		},
		mounted() {
			// 页面加载时生成验证码
			this.generateCaptcha();
		},
		components: {
			Footer
		}
	}
</script>
<style scoped>
	/****************** 总容器 ******************/
	.wrapper {
		width: 100%;
		height: 100%;
	}

	/****************** header部分 ******************/
	.wrapper header {
		width: 100%;
		height: 12vw;
		background-color: #0097FF;
		color: #fff;
		font-size: 4.8vw;

		position: fixed;
		left: 0;
		top: 0;
		z-index: 1000;

		display: flex;
		justify-content: center;
		align-items: center;
	}

	/****************** 表单部分 ******************/
	.wrapper .form-box {
		width: 100%;
		margin-top: 12vw;
	}

	.wrapper .form-box li {
		box-sizing: border-box;
		padding: 4vw 3vw 0 3vw;
		display: flex;
		align-items: center;
	}

	.wrapper .form-box li .title {
		flex: 0 0 18vw;
		font-size: 3vw;
		font-weight: 700;
		color: #666;
	}

	.wrapper .form-box li .content {
		flex: 1;
	}

	.wrapper .form-box li .content input {
		border: none;
		outline: none;
		width: 100%;
		height: 4vw;
		font-size: 3vw;
	}

	.wrapper .form-box li .content .captcha-text {
		font-size: 3vw;
		font-weight: bold;
		color: #000;
		margin-left: 2vw;
		/* 间距 */
		user-select: none;
	}

	.wrapper .form-box li .content .refresh-captcha {
		margin-left: 50vw;
		/* 按钮距离验证码的间距 */
		color: #000000;
		border: none;
		font-size: 3vw;
		padding: 2vw;
		cursor: pointer;
		border-radius: 4px;
		background-color: #e9fff4;
	}


	.wrapper .button-login {
		width: 100%;
		box-sizing: border-box;
		padding: 4vw 3vw 0 3vw;
	}

	.wrapper .button-login button {
		width: 100%;
		height: 10vw;
		font-size: 3.8vw;
		font-weight: 700;
		color: #fff;
		background-color: #38CA73;
		border-radius: 4px;

		border: none;
		outline: none;
	}

	.wrapper .button-register {
		width: 100%;
		box-sizing: border-box;
		padding: 4vw 3vw 0 3vw;
	}

	.wrapper .button-register button {
		width: 100%;
		height: 10vw;
		font-size: 3.8vw;
		font-weight: 700;
		color: #666;
		background-color: #EEE;
		border: solid 1px #DDD;
		border-radius: 4px;

		border: none;
		outline: none;
	}

	/****************** 底部菜单部分 ******************/
	.wrapper .footer {
		width: 100%;
		height: 14vw;
		border-top: solid 1px #DDD;
		background-color: #fff;

		position: fixed;
		left: 0;
		bottom: 0;

		display: flex;
		justify-content: space-around;
		align-items: center;
	}

	.wrapper .footer li {
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;

		color: #999;
		user-select: none;
		cursor: pointer;
	}

	.wrapper .footer li p {
		font-size: 2.8vw;
	}

	.wrapper .footer li i {
		font-size: 5vw;
	}
</style>